Effects of Thermal-Cold Cycling on Dimensional Stability of HIPed Beryllium  

冷热循环处理对热等静压铍材尺寸稳定性的影响

作　　者：Ren Penghe Xiao Lairong Cai Zhenyang Tu Xiaoxuan Zhao Xiaojun 任鹏禾;肖来荣;蔡圳阳;涂晓萱;赵小军(中南大学材料科学与工程学院,湖南长沙410083;有色金属材料科学与工程教育部重点实验室,湖南长沙410083)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Changsha 410083,China

出　　处：《稀有金属材料与工程》2024年第10期2718-2722,共5页Rare Metal Materials and Engineering

基　　金：National Defense Basic Scientific Research Program of China(JCKY2018203B067);Youth Natural Science Foundation of Hunan Province(2019JJ50817)。

摘　　要：The dimensional change,residual stress,grain orientation difference,dislocation density,and dislocation distribution of beryllium after different hot isostatic pressing treatments were analyzed by laser length meter,Raman spectrometer,nanoindentation meter,electron backscattered diffractometer,and transmission electron microscope,and the influence of thermal-cold cycling treatment on the dimensional stability of beryllium was analyzed.Results show that the size of the hot isostatic pressed beryllium tends to be stable after 6 cycles of thermal-cold cycling treatment from-100℃to 150℃,and it has good dimensional stability.The dimensional stabilization mechanism of beryllium is mainly the homogenization of dislocations within the grain and the homogenization of orientation difference caused by micro-plastic deformation.利用激光测长仪、拉曼光谱仪、纳米压痕仪、背散射衍射电镜以及透射电镜分析不同处理状态等静压铍材的尺寸变化、残余应力、晶粒取向差、位错密度及位错分布形态,分析冷热循环处理对铍材尺寸稳定性的影响。结果表明,热等静压铍材在-100~150℃冷热循环6次后尺寸趋于稳定,具有良好的尺寸稳定性。冷热循环处理过程中铍材尺寸稳定化机制主要是晶粒内位错均匀化及微塑性变形导致取向差均匀化。

关 键 词：BERYLLIUM thermal-cold cycling MICROSTRUCTURE dimensional stability 

分 类 号：TG146.24[一般工业技术—材料科学与工程]